Electric fuse plug



ELECTR I C FUSE PLUG Filed May 21, 1919 l9 j I G In 08/2 for; William [Z65 Patented July 3, 1923.

UNITED STATES WILLIAM ILE, OF LYNBROOK, NEW YORK, ASSIGNR T9 HEMCO ELECTRIC MANUFAC- 1,460,675 PATENT oFiucE.

TUBING COMPANY, INC., OF NEW YORK, Ni 1., A CORPORATION OF NEW YORK.

ELECTRIC FUTSE Application filed May 21, 1919. Serial No. 298,820.

To all whom it may concern:

Be it known that I, VVILLIAM ILE, a subject of the King of Great Britain, residing at Lynbrook, in the county of Nassau and State of New York, have invented a new and useful Improved Electric Fuse Plug, of which the following is a specification.

This invention relates to fuse plugs for electric circuits. In the usual construction of plugs of this character a threaded shell contact is provided to co-operate with a similarly arranged terminal contact in the cut out of an electric circuit, and a contact arranged centrally at one end of said shell contact to co-operate with another terminal contact of the cut out in the electric circuit,

said contacts being carried and insulated from each other by a base of insulating material and electrically connected by a fusible element usually carried within the base of insulating material, said base being hollow and open at the end opposite to the end con tact, which opening is closed by a transparent closure to confine any flame or lire which may be created upon the fusing of the fusible element, and also to ascertain whether or not the fusible member has been fused without removal of the plug from the cut out, and it is the object of the invention to improve and simplify the general construction of plugs of this character and to provide a plug which is cheap and novel in construction and highly efficient in use.

In the drawing accompanying and forming a part of this specification, Figure l is a sectional side elevation of a iuse showing an embodiment of my invention.

Figure 2 is a view of the annular member to secure the transparent closure to the open end of the plug and looking the top as viewed from Figure 1.

Figure 3 is a plan view of a member to be clamped between the closure and the plug which may contain indications as to the voltage and amperage oi the electric current for which the plu is ted, Figure 4 is a plan view or the t ent closure; and

Figures 5 and ii are end and side tions, respectively, of a cylindrical ber to engage within the plug.

Similar characters of reference 6 like parts throughout the drferent mews the drawing.

The embodiment oft the invention shewn elevamere.-

in the drawing comprises a'metallic annular threaded shell 7 to constitute one of the tcrtill wire engaging in and protruding through an I opening in the insulating material axially oi? the shell and in an opening in a metallic dish 8 embedded at the peripheral portions in the insulating material, and the protruding end of the wire fused and spread on the outer surface of the disk to secure the wire to the disk and constituting the other terminal contact of the plug, as shown at 11. The other end of the fusible wire is soldered to the inner surface of the shell 7 adjacent the end opposite to the insulating ma-' terial 9, as at 12.

To confine any flame or fire which may be created upon the fusing of the fusible wire 10, and also to view the interior of the plug from the exterior to ascertain whether or not said iuse wire has been fused without removal at the plug from the cut out in the electric circuit, the end of the shell 7 opposite to the insulating closure 9 has a trans parent closure in the form of a disk 18 of insulating material, Figure This transparent closure is held in place by a flanged annular member or ring it of insulating material (Figure 2). The ring 1% has internal threaded portion 15 to correspond. with the "threads of the shell '2' an 1 the flange is adapted to engage the end of the shell to nip the transparent closure between the ed said flange, as shown at this insu mg ring 14 also serves as the means to place the plug in position novc it from the cut out in the electric To prevent the ring from unscrewl wh e placing the same in such amperage of the electric current with which the plug is adapted to be used.

The shell may also be provided with a lining of insulating material in the form of a sleeve 21 (Figures 5 and 6), which is adapted to be slipped into the shell from the end.

and is arranged with a slot 22 for the passage of the fusible wire 10 with a portion 23 extending at right angles to permit rotating the sleeve to lock the same in the shell by the fuse wire. This sleeve is preferably of a material light in color to brighten up the interior of the shell whereby the interior may be readily observed through the transparent closure 13. This sleeve also prevents the creating of an are or the establishing of a circuit upon the fusing of the fusible Wire.

Variations may be resorted to within the scope of the invention, and portions of the invention may be used without others.

Having thus described my invention, I claim:

1. In a fuse plug, a threaded metallic shell contact, an end contact, an insulating closure for one end of the shell molded in embedded relation to and insulating the shell and end contacts from each other and having a central perforation, a fuse wire within the shell in electrical connection with the shell and the end contact through the perforation in the insulating material, a transparent disk of insulating material to close the end of the shell opposite to the end contact, and an annular member having threaded connection with the end of the shell for clamping the transparent closure disk and arranged to serve as a fingerpiece to manipulate the plug. V

2. In a fuse plug, a threaded metallic shell to constitute a terminal contact of the plug, a closure for one end of the shell consisting of insulated material molded in embedding relation to one end of the shell and arranged with a central perforation, a fusible element within the shell electrically connected at one end with the interior of the shell and the pposite end of said element secured in the perforation in the molded closure to constitute an end terminal contact of the plug, a transparent disk closure for the open end of the shell, an annula'r member arranged for threaded connec tion with the shell and having an annular flange arranged to engage at the end of the shell and clamp the transparent closure between said flange and the end of the shell, and a perforate member juxtaposed to the transparent disk arranged with descriptive matter for the purpose specified.

3. A fuse plug comprising a threaded shell contact; insulating material at one end of the shell molded in embedding relation thereto and serving to close said end of the shell and having a restricted opening therethrough axially of the shell; a fusible Wire within the shell with one end in electrical connection with the shell and the other end extending through the opening in the insulating material with a portion thereof flattened exterior of said material to constitute the ther terminal contact of the plug; a sleeve of insulating material arranged to be slipped into the open end of the shell; :1 disk of transparent material to engage the end of the shell opposite to the insulating material; and an annular flanged member arranged tobe threaded onto the shell and clamp the disk to the end of the shell.

WILLIAM ILE. 

